As the answers here indicate Ubuntu
.iso s are not expected to boot if copied with
dd to a USB thumb drive.
Now my question is why is so that some Linux distributions have the option to directly write their bootable
.iso file to a thumb drive with
dd but some (read Ubuntu) have not(for Ubuntu I think it has to be converted to
.img first). Is it for some architectural difference in
.isos? Or is it due to any limitation of
I don't know if it is off-topic here. I can move it to a more proper place if the community thinks so or suggests one. Some explanation would be appreciable.